Stellar rotation: Evidence for a large horizontal turbulence and its effects on evolution

Abstract

We derive a new expression for the coefficient $D_{\mathrm{h}}$ of diffusion by horizontal turbulence in rotating stars. This new estimate can be up to two orders of magnitude larger than given by a previous expression. As a consequence the differential rotation on an equipotential is found to be very small, which reinforces Zahn's hypothesis of shellular rotation. The role of the so--called $\mu$--currents, as well as the driving of circulation, are reduced by the large horizontal turbulence. Stellar evolutionary models for a 20 M$\odot$ star are calculated with the new coefficient. The new and large $D_{\mathrm{h}}$ tends to limit the size of the convective core and at the same time it largely favours the diffusion of helium and nitrogen to the surface of rotating OB stars, a feature supported by recent observations.

8 pages, 5 figures, accepted for publication in A& A

References in corpus (1)

• Rotational mixing in low-mass stars : I Effect of the mu-gradients in main sequence and subgiant Pop I stars

Cited by in corpus (58)

• The early star generations: the dominant effect of rotation on the CNO yields
• Probing the interior physics of stars through asteroseismology
• Seismic diagnostics for transport of angular momentum in stars 1. Rotational splittings from the PMS to the RGB
• Angular Momentum Transport in Stellar Interiors
• Very low metallicity massive star models: Pre-SN evolution and primary nitrogen production
• Hydrodynamical stellar models including rotation, internal gravity waves and atomic diffusion. I. Formalism and tests on Pop I dwarfs
• Rotational mixing in low-mass stars II. Self-consistent models of Pop II RGB stars
• On shear-induced turbulence in rotating stars
• Transport and mixing in the radiation zones of rotating stars: I-Hydrodynamical processes
• Stellar evolution with rotation and magnetic fields:III: The interplay of circulation and dynamo
• Diagnoses to unravel secular hydrodynamical processes in rotating main sequence stars
• Solar system genealogy revealed by extinct short-lived radionuclides in meteorites
• Stellar evolution with rotation and magnetic fields:I. The relative importance of rotational and magnetic effects
• The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters
• Non standard s-process in massive rotating stars. Yields of $10-150$ $M_{\odot }$ models at $Z=10^{-3}$
• Magneto-Thermohaline Mixing in Red Giants
• Effects of rotational mixing on the asteroseismic properties of solar-type stars
• Effects of rotation on the helium burning shell source in accreting white dwarfs
• The thermohaline, Richardson, Rayleigh-Taylor, Solberg-Hoiland, and GSF criteria in rotating stars
• Close binary evolution I. The tidally induced shear mixing in rotating binaries
• Anisotropic turbulent transport in stably stratified rotating stellar radiation zones
• Angular momentum redistribution by mixed modes in evolved low-mass stars. I. Theoretical formalism
• A Model of Magnetic Braking of Solar Rotation That Satisfies Observational Constraints
• Models of Procyon A including seismic constraints
• Constraints on rotational mixing from surface evolution of light elements in massive stars
• A model of rotating convection in stellar and planetary interiors: I - convective penetration
• Stellar evolution of massive stars with a radiative alpha-omega dynamo
• Shear mixing in stellar radiative zones - II. Robustness of numerical simulations
• Transport processes in stars: diffusion, rotation, magnetic fields and internal waves
• Magnetic braking of stellar cores in red giants and supergiants
• The coupling between internal waves and shear-induced turbulence in stellar radiation zones: the critical layer
• 3He-Driven Mixing in Low-Mass Red Giants: Convective Instability in Radiative and Adiabatic Limits
• Towards a unified model of stellar rotation
• Models of rotating massive stars: impacts of various prescriptions
• Chemical Mixing Induced by Internal Gravity Waves in Intermediate Mass Stars
• Horizontal shear instabilities in rotating stellar radiation zones: I. Inflectional and inertial instabilities and the effects of thermal diffusion
• Modeling beta Virginis using seismological data
• Horizontal shear instabilities in rotating stellar radiation zones: II. Effects of the full Coriolis acceleration
• Rotation and magnetism in intermediate mass stars
• The effects of surface fossil magnetic fields on massive star evolution: III. The case of $\tau$ Sco
• Influence of Rotation on Stellar Evolution
• The GSF Instability and Turbulence do not Account for the Relatively Low Rotation Rate of Pulsars
• Towards a unified model of stellar rotation II: Model-dependent characteristics of stellar populations
• Red supergiants and stellar evolution
• The traditional approximation of rotation for rapidly rotating stars and planets. II. Deformation and differential rotation
• Physics of rotation in stellar models
• Evolution and Nucleosynthesis of Very Massive Stars
• Constraints on the properties of macroscopic transport in the Sun from combined lithium and beryllium depletion
• Massive stars evolution with new C12+C12 nuclear reaction rate -- the core carbon-burning phase
• The spin-up of a star gaining mass in a close binary system on the thermal time scale
• Nucleosynthesis from massive stars 50 years after B2FH
• The effect of turbulent mixing on the g-mode spectrum of MS stars
• Anisotropic turbulent transport with horizontal shear in stellar radiative zones
• Evolution of Massive Stars along the Cosmic History
• Nonlinear internal waves breaking in stellar radiation zones. Parametrisation for the transport of angular momentum: bridging geophysical to stellar fluid dynamics
• Calibrating chemical mixing induced by internal gravity waves based on hydrodynamical simulations; The chemical evolution of OB-type stars
• Impact of the Tayler magnetic instability on the surface abundance of boron in massive stars
• 2D dynamics of the radiative core of low mass stars